Motor-controller.



T, E. BARNM.

MOTOR CONTROLLER. APPLIUATION FILED Mule, 1909.

1,07'95386,v Patented Nov. 25, 191s.

a citizen of 'the United States, residing at State of Wisconsin, have invented new and useful-Improvements in MotorfControllers,

vlin'vention will be hereinafter clearly and fully set forth.. v

f 20 drawing, -which kembodies my invention in tlonisisusceptibleofvarious modifications.

325: thereof being shown in `section. This figure- '30 The several partsv of the device are preferably mounted upon an insulating panel or UNITED'sTATEs PATENT OFFICE;

i f THOMAS EBARNIIM, OFIHLWAUKEE, WISCONSIN, AssICNoR TO THE CUTLER- HAMMER MFG; Co., or MILWAUKEE, WISCONSIN, A CORPORATION or WISCONSIN-,

` MOTORLCONTROLLER. W

p Speciication of Letters Patent. Patented NOV, 25, 1913,

I' Application led May 13,1909. Serial No. 495,738.

" lTo all whom 15 mag/Concern Y, and the collar 16 is a coil spring 17, `which Be itfknown that I, THOMAS E. BARNUM,

tends to hold the pin 14 in the yposition illustrated in Fig. 2. The pin 14: serves as a means for connecting the rocker" arm l1 Yto the controlling arm 3 in the following mannen The arm 3 is enlarged portion 18, in which is provided a series of apertures 19. The pin 14; isf ar- Mllwaukee, inthe countyof Milwaukee and of which the following is a full, clear, concise, and exact description, reference being .hadl to theaccompanying drawing, forming in `the arm 3, and in this way connects' the arm 3 to the rocker arm 11. The purpose of this arrangement will be hereinafter,k set forth.

The rocker arm 11 is adapted to beactuated by asolenoid 20, mounted in a .shitable frame 21, secured to the base 1 byany suitable means such asbolts 22.. The solenoid is provided with a movableplunger 23, which is connected by `link 24 to IftheY rocker arm 11. Hence, when the solenoid 20 is energized, it draws in its plunger 23, thereby raising the rocker arm 11. The rocker ling arm 3. The rocker arm 11 is preferably provided with an extension 25, which carries at its extremity an upwardly extending pin 26; The pin 26 preferably comprises a screw which may be suitably adjusted. Arranged in the pat-h of thevpin 2Gv is a switch 27. prises a strip of .cured at one end carried by the panel 1 and adapte other end to engage a suitable Contact 29 also secured to th'e base v1. When therocker arm 11 reaches the limit of its movement, the pin 2.6 carried thereby engages the switchv 27, thereby opening the same and maintaining the same open until the: rocker arm l1 descends.

y invention 'relates to improvements incontrollers A'forf electric motors, and more particularly toA adjustable speed regulators.

The various objects and advantages of my In order to 'fullyidis'close'thecharacteris-p tic features'of my inventiomI shall describe vthe device illustratedin the accompanying its 'pre erred form. Ofcourse, my inven- Inithelaccompanying drawing, Figure 1 is a `frontjelevation Otadevice, a portion also" illustrates diagrammatically one Circuit `-arrangement'for the device., Fig. 2 is asectional' View taken through a portion of the device.

spring metal rigidly. sebasel.- -Fulcrumed on la pin or stud 2 pro- Mjecting from the basel 1s an arm 3. At its outer end, the arm 3 .carries contact brushes 4 and 5. 'As the arm 3 is moved, the brush 44` isv adapted to pass over a series of-cOnt-acts and a Contact segment 7, while the' brush 5 is adaptedl toy pass over a Con- Vtact. segment *8. to" a' series of contacts 9. 40 Do'wnward movement of the arm 3 is limited by sto "10 mounted on the base 1. The arm3fi's a apted to bealctuated by arocker arm 11, which is lalso fulcrumed on the in orstud 2. The rockerl arm 11 is pre erably'fprovided witha lateral extension 12, provided at its eXtrem-ity with a hollow V `cylindricalportion 13;v -(See Fig. 2.) EX- tendinglonigitudinally:through the cylindric'al portion 13 is apin 14g, .provided with `a head-15,l adapted to bear against the top ,of the portion 13.`j` kSuitably secured to the '.pin 14, within thecylindrical portion 13, is a collar 16, which coperates with the inner wall offthe portion 13 to guidepthe pin 14. 5@ Surroundingthe pin 14and interposed between the top of the cylindrical portion 13 the rocker arm 1l and the arm 3, I prefer;-

1s preferably pivoted to a support 31v secured to the base 1.

prefer to use an oil dash pot havingthe forth. The dash pot illustrated lis provided ment Of the plunger 32 in an upward direction, the same may be provided with apertures'34, adapted to be closed by valve 35 when the plunger descends. At the provided with an The switch 27 preferably com-l In practice, the dashpot may assume any preferred form, but I` characteristics which will be hereinafter set with a plunger 32, which is connectedA by a'y rod '33 to'an extension of the rocker arm 11. In order to permit freedom of moveranged to t into anyof the aperturesA 1965 arm 11, in turn, raises the 'control-N For retardingtl'ie upward movement.

ably provide a dash pot 30. The dash `pot i loo lower end of the dash pot are provided two series of apertures 36 and 37, which communicate with an enlarged outer chamber 38. With this arrangement, as the rocker arm 11 is moved upwardly, the plnngeriii .the dash pot is forced downwardly, and, when moved in this directiomrctards the movement of the rocher arm il. its the plunger 32 passes the apertures 36 at the lower end of the dash pot, the fluid beneath the plunger is forced through the apertures I'37 into the chamber 38, and thence back through the apertures 3G. This practically eliminates all opposition to the downward movement of the plunger of the dash pot, and consequently allows the rocker 'arm 1l to be moved freely at the end of its travel. This, together with the fact that the mag neticpull upon the plunger otthesolenoid becomes very great as the plunger nears the limit of its travel, the rocker arm is moved very rapidlyvas it reaches the limit of its travel; This causes the pin carried by the rocker arm 11 .to'impart more or4 less of a. quick blow 'to the switch 27, thereby Opening, the same very quickly. The rocker arm 11 is always'drawn to the limit ot its movement when its operating solenoid is ener ized, and, consequently, the plunger oi the ash pot will always complete its sti-olie, y thereby alwaysl insuring a quiclr` opening ot the switch 2 y The circuit diagram which I have shown is very simple and serves merely to disclose the functions ofthe device. The motor illustrated is of the shunt wound type, being provided with an armature A and a shunt field winding F. Of course, a compound motor could be used instead of a shunt wound motor. One terminal ofthe motor armature is connected by conductor through a double pole switch 4l to one side of the supply circuit. The opposite terminal of the motor armature is connected by 4,5 conductors 42 and 43 to contact segment 7. Contact segment 7 is connected to the iirst adjacent contact of the series of contacts 6, All of the series of contacts 6 are connected to an armature resistance 44. One terminal of the shunt field winding of the motor is connected to conductor 40, while its op' posite terminal is connected by conductor 45 to ContactI segment 8. Contact segment 8 is connected to the first adjacent contact of the series of contacts 9. The contacts 9 are all connected to a field regulating .resistance '46. The arm 3 is connected by conductors "47 and 48 through the switch 4l'to the opposite side of the main line. @ne terminal of the solenoid winding 20 is connected by conductor 49 to conductor 40, whi'leits opposite. terminal is connected by conductor 50 through switch 27 by conductor 5l to con ductor` 47. The switch 27, when closed, shortcircuits'a resistance 52.

circuit is closed through the motor. The armature circuit niay be traced from conductor 40 through the armature, by conductors 42 and 43 to contact segment 7, thence through all of the resistance 44 to vthe arm 3, and through said arm by consupply circuit. The field circuit of the motor may be traced from conductor 40 through the field winding by conductor 45 to contact segment 8, thence directly through the arm 3 and by conductors 47 and 48 to the opposite side oi' the supply circuit. The motor is thus started with all of the resistance 44 in its armature circuit and Vwith no resistance in its field circuit. Upon closure ofthe motor circuit, circuit is also closed from conductor 40 by conductor 49, through the Vsolenoid winding 20, through switch 27, by' conductor 5l to conductor 47. 'ihis causes the energization of the winding 2O which immediately draws up its plunger, thereby operating the rocker arm 1l against arm ll in turn gradually moves the arm 3 upwardly, thereby gradually removing the armature resistance from circuit and inarm 3 has been sufficiently raised to remove all of the armature rosistaiice from circuit, the brush 5 carried thereby passes from the segment 8 onto the contacts 9. Further movement of the arm 3 gradually inserts the resistance 46 in the field circuit of the motor, thereby gradually increasing the speed of the moto-r. The number of the contact 9 over which the brush 5 is thus moved depends upon the adjustmentbetween the rocker arm l1 and the arm 3. Regardless of this adjustment, however, as the rocker arm ll approaches the limit of its movenient, the pin 26 carried thereby strikes the switch 27, thereby opening the same with a quick action. This results iii inserting the resistance 52 in' the circuit of the solenoid 20. The resistance 52 is so proportioned as to reduce the fiow of current through the winding to an amount just suilicient to maintain the plunger 23 in final position. lVith the frocker arm and controlling arm connected as illustrated, the arm 3 would probably not pass over more than one or two oi the field regulating contacts and, consequently, the motor would not attain its. highest speed, but would operate at an intermediate speed. To vary the maximum speed at which it is desired to' operate the motor, it is'only necessary to withdraw the pin connecting the two varnisand insert the same in another one of the apertures in the arni 3. To increase the maximum speed of the motor, the pin should be inserted in one of lower apertures, and, to decrease fasse l shall now describe the operation of the controller. Upon closure of the switch 41,

ductors 47 and 4S to the opposite side of the the action of the dash pot 30. The rocker creasing the speed of the motor. After the the maximum speed, the pin should be inserted in one of the upper apertures. Of course, the armature resistance might be designed merely for starting the motor and not for regulating the speed thereof, and, in such an event, the speed of the motor should be ,varied by varying the field resistance.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is l 1. In a controller for electricmotors, in combination, a movable controlling element, a pivoted operating member therefor, having a limited movement and an adjustable connection between said member and said element for varying the limit of movement of saidl element.

2. In a controller for electric motors, in combination, a pivoted' contact device, an operating member therefor, pivoted concentrically therewith, said operating member having a limited movement and an adjustable connection between said member v.and said element for varying the limit of movement of said device.

3. In a controller for electric motors, in con'ibination,a movable controlling member, a movable operating member therefor, having a limited movement, one of said members having a plurality of apertures therein, and the other of said members having a device arranged to t into any of said apertures to adjustably connect said members to vary the limitl of movement of said controlling member.

4. In a `controller for electric motors, in combinatioma pivoted contact member` a pivoted operating member therefor, having a. limitedl movement, said members being pivoted concentrically, one of said members having a series of apertures therein, and the other of said members Ahaving` a spring pressed device adapted to fit intodifferent apertures to adjustably connect said members to vary the limit of movement of said Contact member.

5. In a controller for electric motors, in combination, a pivoted controlling element,

' a plurality of resistance contacts arranged to be engaged thereby, an automatically operated rocker arm for actuating' said element, said rocker having a limited movement, and an adjustable connection between said arm and said element for causing said arm to stop said element in final position on Aditl'erent contacts.

6. In a cont-roller for electric motors, in combination, a movable controlling element, an automatically operated rocker arm for operating said element, said arm having a limited movement, an adjustable connection between said arln and said element for varying the limit of movement of said element,

a switch adapted to be actu ated by said arm upon reaching the limit f-.f' its movement, andy means for retarding the operation of said arm, said means being arranged to ermitsaid arm to accelerate at the limit o its movement to quickly actuate said switch.

7. In a controller for electric motors, in combination, a movable controlling element,

a pivoted member for actuating said ele-l ment, a solenoid for moving said member to a predetermined limit, an adjustable connection between said member and said element for varying the limit of movement of said element, a switch arranged to be operated byv said member at the'limit of its movement t9" reduce theiow'of current through its operating solenoid, and means for retarding the operation of said member, said means being arranged to permit said member to. accelerate at the limit of its movement to quickly actuate said switch.

8. In a controller for electric motors, in combination, an armature resistance, a field resistance, a controlling element adapted to be actuated to gradually remove said armature resistance from circuit, and then gradually insert said eld resistance in circuit, a rocker arm for actuating said element, a solenoid for moving said arm to a predetermined limit, and an adjustable connection between said arm and said element, for causing said arm to bring said element to rest in different predetermined positions to cause the mot-or to operate at different'predetermined speeds.

9. In a controller for electric motors, in combination, an armature resistance, a field resistance, a controlling element adapted to be actuated to gradually remove said armature resistance from circuit, and then gradually insert said field resistance in circuit, a rocker arm for actuating said element, a solenoid for moving said arm to a predetermined limit, an adjustable connection betweensaid arm and said element, for causing said arm to bring said element to rest in different predetermined positions to cause the motor to operate at different predetermined speeds, a switch arranged to be actuated by said "arm at the limit of its movement to .reduce the flow of current through said solenoid, and a. dash pot connected to said arm to retard the same, said dash pot being constructed to permit said arm to accelerate at the limit of its movement to quickly actuate said switch.

In witness whereof, I have hereunto subscribed my n'ame in the presence of two witnesses.

. THGMAS E. BARNUM.

iVitnesses':

FRANK H. IIUBBARD, SHEPLER lV. Frrz GERALD. 

